indigoid

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indigoid
indigoid, a. (n.) (ˈɪndɪgɔɪd) [a. G. indigoid (P. Friedländer 1908, in Ber. d. Deut. Chem. Ges. XLI. 773): see indigo n. (a) and -oid.] Of a dye: similar to indigotin in chemical structure, spec. in having another atom or atoms, esp. of sulphur, in place of one or both of the imino-groups. Hence as ... Oxford English Dictionary
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thioindigo
thioindigo (θaɪəʊˈɪndɪgəʊ) [f. thio- + indigo n. (a.).] A red vat dye in which the two imino groups of indigotin are replaced by sulphur atoms; also, any of various derivatives of this also used as dyes.1906 Textile Colorist XXVIII. 321/1 Messrs. Kalle & Co., Aktiengesellschaft, have placed upon the... Oxford English Dictionary
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Huaca Prieta
Analysis of the pigment used on the cloth identified it as indigotin, an indigoid dye. wikipedia.org
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